CN107561351A - The output voltage current sensing means and rapid analysis method of grid-connected inverting system - Google Patents
The output voltage current sensing means and rapid analysis method of grid-connected inverting system Download PDFInfo
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- CN107561351A CN107561351A CN201710825195.7A CN201710825195A CN107561351A CN 107561351 A CN107561351 A CN 107561351A CN 201710825195 A CN201710825195 A CN 201710825195A CN 107561351 A CN107561351 A CN 107561351A
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Abstract
The present invention proposes the output voltage current sensing means and rapid analysis method of a kind of grid-connected inverting system, including voltage transformer, current transformer, the first low pass filter, the second low pass filter, primary sinusoid square wave conversion circuit, the second sine wave square wave conversion circuit, four-quadrant multiplier and controller.Sine wave is become square wave by the present invention respectively using two sine wave square wave conversion circuits, for detecting the frequency and phase relation of output voltage and output current, it can judge whether the output voltage of grid-connected inverting system and electric current occur boosting or loading situation jumpy with a currently available A/D transformation result, whether can occur the excessively stream that can not be born for a long time and boosting phenomenon with real-time judge grid-connected inverting system.The present invention improves accuracy of detection, improves detection speed, and the working condition of inverter can be judged in controller, and the foundation for providing signal detection is automatically controlled for combining inverter.
Description
Technical field
The present invention relates to power electronics and the technical field automatically controlled, more particularly to a kind of output of grid-connected inverting system
Voltage and current detecting device and rapid analysis method.
Background technology
Grid-connected inverting system frequently encounters phenomena such as island effect, overvoltage and vibration, and these phenomenons are not if taken fruit
Disconnected counter-measure easily causes grid-connected inverting system to be damaged.Wherein, island effect refer to power system power-off and inversion system
Still continuous output.
The sampled signal of the voltage and current of grid-connected inverting system is AC signal, and its changing rule lacks intuitive, by
In the magnitude relation and phase relation of the sampled signal for being unable to high speed analysis voltage and current, controller is for the orphan that instantaneously occurs
The judgement of phenomena such as island effect, overvoltage and vibration brings certain difficulty.Current controller typically using ARM, DSP,
The devices such as FPGA, the A/D sample ports of these devices can only input the positive signal for being unable to zero passage, and the signal voltage upper limit is generally
2.5V ~ 3.3V, to make some processing before sampling to signal can just obtain positive signal, therefore the real-time of these process circuits,
Grade of errors and the linearity have a great influence to signal sampling.
The sampled signal of the voltage and current of grid-connected inverting system is AC signal, and its changing rule lacks intuitive, such as
What quick sampling is a problem.The method that sampled signal is transformed into direct current by traditional process circuit by exchanging is rectification or electricity
Press lifting.The diode of rectification circuit is a non-linear element, and the quality that can seriously affect waveform drops in constant voltage.Voltage
Lifting circuit is by one DC component of voltage superposition, AC signal is lifted to the degree of not zero passage, after lifting
Electric current not zero passage, the method for reducing AC signal amplitude is usually taken, can so have a strong impact on the sampling precision of signal.
The content of the invention
Grid-connected inverting system, which can not directly and be quickly detected, for controller island effect, overvoltage and vibration occurs
Phenomena such as technical problem, the present invention proposes a kind of output voltage current sensing means of grid-connected inverting system and quick analysis side
Method.
In order to achieve the above object, the technical proposal of the invention is realized in this way：A kind of output of grid-connected inverting system
Voltage and current detecting device, including voltage transformer, current transformer, the first low pass filter, the second low pass filter, first
Sine wave-square wave conversion circuit, the second sine wave-square wave conversion circuit, four-quadrant multiplier and controller, the mutual induction of voltage
The input of device summation current transformer is connected with combining inverter, and voltage transformer is connected with the first low pass filter,
First low pass filter is connected with the first via multiplier of four-quadrant multiplier, the first via multiplier of four-quadrant multiplier with
Controller is connected；The voltage transformer is connected with the primary sinusoid-square wave conversion circuit, and the primary sinusoid-square wave turns
Circuit is changed with controller to be connected；The current transformer is connected with the second low pass filter, the second low pass filter and four
No. second multiplier of quadrant multiplier is connected, and No. second multiplier of four-quadrant multiplier is connected with controller；Electric current
Transformer is connected with the second sine wave-square wave conversion circuit, and the second sine wave-square wave conversion circuit is connected with controller.
The output voltage of the combining inverteru oReference output plus terminal and resistanceR 11Voltage transformer is connected after series connection
Primary coil different name end, the Same Name of Ends and output voltage of the primary coil of voltage transformeru oReference output negative terminal phase
Even, the secondary coil both ends connection resistance of voltage transformerR 12Both ends；The Same Name of Ends of the secondary coil of the voltage transformer
With resistanceR 13It is connected, resistanceR 13With electric capacityC 11Branch road and resistance in seriesR 12Parallel connection, electric capacityC 11With resistanceR 12Between
Tie point be connected with earth terminal GND, resistanceR 13With electric capacityC 11The tie point of series connection is same mutually defeated with operational amplifier A MP2's
Enter end to be connected, operational amplifier A MP2 is connected with positive 5V and negative 5V power supply, resistanceR 14With resistanceR 15Branch in series
Road both ends difference concatenation operation amplifier AMP2 output and ground GND, resistanceR 14With resistanceR 15Between tie point with
Operational amplifier A MP2 inverting input is connected；The output end of the operational amplifier A MP2 respectively with four-quadrant multiplier
The input pin X1 of first via multiplier is connected with input pin Y1, and the output of the first via multiplier of four-quadrant multiplier is drawn
Pin W1 and controller input pin A/D1It is connected.
The Same Name of Ends and diode of the secondary coil of the voltage transformerD 1It is connected, diodeD 1With resistanceR 1Mutually go here and there
Connection, resistanceR 1With resistanceR 2Form resistance series circuit, resistanceR 2The other end is connected with earth terminal GND, resistanceR 1With resistanceR 2
Tie point and resistanceR 3Connection, resistanceR 3With electric capacityC 1It is connected, electric capacityC 1It is connected with earth terminal GND, resistanceR 3With electric capacityC 1Tie point and resistanceR 4Connection, resistanceR 4Be connected with operational amplifier A MP1 in-phase input end, operational amplifier A MP1 with
Positive 5V is connected with negative 5V power supply, resistanceR 5Concatenation operation amplifier AMP1 reverse input end and earth terminal GND, electric capacityC 2
And electric capacityC 3It is connected with earth terminal GND, electric capacityC 2It is connected with negative 5V power supply, electric capacityC 3It is connected with positive 5V power supply；
For operational amplifier A MP1 output end by being connected with earth terminal GND, operational amplifier A MP1 output end passes through resistanceR 6
It is connected with positive 5V power supplys, operational amplifier A MP1 output end and the I/O of controller1Port is connected.
The output current of the combining inverteri oThrough the iron core of current transformer, current transformer and resistanceR 21It is in parallel
Connection, resistanceR 21It is connected with earth terminal GND, the output end and resistance of current transformerR 22It is connected, resistanceR 22With electric capacityC 21
Branch road and resistance in seriesR 21Parallel connection, resistanceR 22With electric capacityC 21The same phase of the tie point of series connection and operational amplifier A MP3
Input is connected, and operational amplifier A MP3 is connected with positive 5V and negative 5V power supply, resistanceR 23With resistanceR 24In series
Branch road both ends are connected with operational amplifier A MP3 output and ground GND respectively, resistanceR 23With resistanceR 24Between company
Contact is connected with operational amplifier A MP3 inverting input, operational amplifier A MP3 output end and four-quadrant multiplier
The input pin X2 of No. second multiplier is connected with input pin Y2, and the output of No. second multiplier of four-quadrant multiplier is drawn
Pin W2 and controller input pin A/D2It is connected.
The current transformer and diodeD 31It is connected, diodeD 31With resistanceR 31It is in series, resistanceR 31With resistanceR 32It is in series, resistanceR 32It is connected with earth terminal GND, resistanceR 31With resistanceR 32Between tie point and resistanceR 33Connection, electricity
ResistanceR 33With electric capacityC 31It is connected, electric capacityC 31It is connected with earth terminal GND, resistanceR 33With electric capacityC 31Tie point and resistanceR 34Even
Connect, resistanceR 34It is connected with operational amplifier A MP4 in-phase input end, operational amplifier A MP4 and positive 5V and negative 5V power supply
It is connected, resistanceR 35Both ends be connected to operational amplifier A MP4 reverse input end and earth terminal GND, electric capacityC 32It is connected to
Just between 5V power supplys and earth terminal GND, electric capacityC 33It is connected between negative 5V power supplys and earth terminal GND；Operational amplifier A MP4's
Output end passes through diodeD 32It is connected with earth terminal GND, operational amplifier A MP4 output end passes through resistanceR 36With positive 5V electricity
Source is connected, operational amplifier A MP4 output end and the I/O of controller2Port is connected.
The primary coil of the voltage transformer and the turn ratio of secondary coil are 1：1；ResistanceR 13, electric capacityC 11, computing puts
Big device AMP2, resistanceR 14, resistanceR 15Form the first active low pass filter of single order；ResistanceR 22, electric capacityC 21, operational amplifier
AMP3, resistanceR 23, resistanceR 24Form the second active low pass filter of single order.
A kind of rapid analysis method of the output voltage electric current of grid-connected inverting system, step are as follows：
Step 1：The output voltage current sensing means of grid-connected inverting system is built, by the primary coil of voltage transformer and simultaneously
The output voltage of net inverteru oParallel connection, by output voltageu oChange into the voltage signal of low-voltage alternating-currentu op, voltage signalu opBy
The primary sinusoid-square wave conversion circuit changes into square-wave signalu odI/O to controller1Port；Voltage signalu opIt is low by first
Bandpass filter filters to obtain voltage signalu os, two voltage signalsu osThe first via multiplier of four-quadrant multiplier is connected respectively
Two inputs obtain signal 0.4u os 2, signal 0.4u os 2It is delivered to the A/D of controller1Port；Current transformer will be grid-connected
The output current of inverteri oChange into the voltage signal of low-voltage alternating-currentu iop, voltage signalu iopTurned by the second sine wave-square wave
Change circuit and change into square-wave signalu iodI/O to controller2Port；Voltage signalu iopFilter to obtain by the second low pass filter
Voltage signalu ios, voltage signalu iosConnecting two inputs of No. second multiplier of four-quadrant multiplier respectively makes two electricity
Press signalu iosAfter multiplication signal 0.4 is obtained multiplied by with 0.4u ios 2, signal 0.4u ios 2It is delivered to the A/D of controller2Port；
Step 2：Controller obtains square-wave signalu odFrequencyf 1, controller compares square-wave signalu odWith square-wave signalu iod's
Phase difference valueα-β,αFor output voltageu oPhase angle,βFor output currenti oPhase angle；
Step 3：A/D converter inside controller is by signal 0.4u os 2It is converted into digital quantity and is stored in memory, whereinu os=
|u os|sin(α)；Signal 0.4 is taken out from the memory inside controlleru os 2BeforeT 1/ 4 moment waveform 0.4 [|u os|sin
(α+90)]2Corresponding digital quantity, obtains output voltageu oVirtual valueU CAL=k 1·0.4{(|u os|sinα)2+[|u os|sin(α+
90)]2, wherein,k 1For constant coefficient, unit 1/V；
Step 4：A/D converter inside controller is by signal 0.4u ios 2It is converted into digital quantity and is stored in memory, whereinu ios
=|u ios|sin(α)；Signal 0.4 is taken out from the memory inside controlleru ios 2BeforeT 1/ 4 moment waveform 0.4 [|u ios|
sin(α+90)]2Corresponding digital quantity, obtain output voltage electric currenti oVirtual valueI CAL=k 2·0.4{(|u ios|sinα)2+[|u ios|sin(α+90)]2, wherein,k 2For constant coefficient, unit 1/A；
Step 5：The rated output apparent energy of grid-connected inverting systemS e=U CAL·I CALIt is expressed as in two-dimentional phase-plane diagram
Power curve I and constant power curve II；It is reliably working area between the reference axis of constant power curve I and two-dimentional phase plane；Deng
It is overload region between power curve I and constant power curve II, when output apparent energySSurmount constant power curve I afterwards to enter
Carry area；It is shorting region outside constant power curve II, when output apparent energySSurmount constant power curve II and enter shorting region afterwards；
Step 6：The two-dimentional phase-plane diagram established by step 5 judges the output voltage of combining inverteru oAnd output currenti oWhether situation jumpy is boosted or loaded in appearance.
The output voltage of the combining inverteru oWith output currenti oWhen increased ratio is essentially identical, it is judged as voltage
Drastically raise and load and be basically unchanged, steady operation point moves rapidly to the upper right side of the first quartile of two-dimentional phase-plane diagram；When
Output voltageu oIt is basically unchanged, output currenti oWhen increased dramatically, it is judged as that load increased dramatically, steady operation point is rapidly to two
Tie up the surface movement of phase plane first quartile.
If operating point constant power direction of curve reciprocating vibration in two-dimentional phase-plane diagram interior edge, then it represents that parallel network reverse
There is reactive power oscillation in system, and active output is basically unchanged；
If operating point the direction reciprocating vibration vertical with constant power curve in two-dimentional phase-plane diagram interior edge, then it represents that grid-connected inverse
There is active vibration in change system, and idle output is basically unchanged；
If operating point in two-dimentional phase-plane diagram neither along constant power direction of a curve reciprocating vibration, also not along with constant power
The vertical direction reciprocating vibration of curve, but rambling vibration, then it represents that chaotic oscillation occurs in grid-connected inverting system.
Beneficial effects of the present invention：The voltage of positive and negative alternation, current signal are transformed into permanent positive signal, effectively increased
Accuracy of detection；Multiplication and iterative algorithm are reduced as far as possible, detection speed are improved, with a currently available A/D transformation result
It can judge whether the output voltage of grid-connected inverting system and electric current occur boosting or loading situation jumpy, can control
The working condition of inverter is judged in device processed, whether controller can occur bearing for a long time with real-time judge grid-connected inverting system
Excessively stream and boosting phenomenon, for combining inverter automatically control provide signal detection foundation.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the theory diagram of the present invention.
Fig. 2 is the circuit diagram of the present invention.
Fig. 3 is the waveform diagram that sine wave of the present invention is converted to square wave.
Fig. 4 is that the sampling parameter of output voltage of the present invention calculates schematic diagram.
Fig. 5 is that the sampling parameter of output current of the present invention calculates schematic diagram.
Fig. 6 is the present invention to overloading the criterion schematic diagram with boosting situation.
Fig. 7 is criterion schematic diagram of the present invention to oscillatory condition.
In figure, 1 is voltage transformer, and 2 be current transformer, and 3 be the first low pass filter, and 4 be the second low pass filter,
5 be the primary sinusoid-square wave conversion circuit, and 6 be the second sine wave-square wave conversion circuit, and 7 be four-quadrant multiplier, and 8 be control
Device, 9 be combining inverter.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not paid
Embodiment, belong to the scope of protection of the invention.
As shown in figure 1, a kind of output voltage current sensing means of grid-connected inverting system, including voltage transformer 1, electric current
Transformer 2, the first low pass filter 3, the second low pass filter 4, the primary sinusoid-square wave conversion circuit 5, the second sine wave-
Square wave conversion circuit 6, four-quadrant multiplier 7 and controller 8, the input of the summation current transformer 2 of voltage transformer 1 with
Combining inverter 9 is connected, and voltage transformer 1 is connected with the first low pass filter 3, the first low pass filter 3 and four-quadrant
The first via multiplier of multiplier 7 is connected, and the first via multiplier of four-quadrant multiplier 7 is connected with controller 8；The electricity
Pressure transformer 1 is connected with the primary sinusoid-square wave conversion circuit 5, the primary sinusoid-square wave conversion circuit 5 and the phase of controller 8
Connection；The current transformer 2 is connected with the second low pass filter 4, the second low pass filter 4 and four-quadrant multiplier 7
No. second multiplier is connected, and No. second multiplier of four-quadrant multiplier 7 is connected with controller 8；Current transformer 2 and
Two sine waves-square wave conversion circuit 6 is connected, and the second sine wave-square wave conversion circuit 6 is connected with controller 8.
The primary coil of voltage transformer 1 and the output voltage of combining inverter 9u oParallel connection, by output voltageu oChange into
The voltage signal of low-voltage alternating-currentu op, voltage signalu opSquare-wave signal is changed into by the primary sinusoid-square wave conversion circuit 5u odGive
The I/O of controller 81Port.Voltage signalu opVoltage signal is obtained by the filtering of the first low pass filter 3u os, voltage signalu osPoint
Two inputs of the first via multiplier of two-way connection four-quadrant multiplier 7, two voltage signalsu osMultiplied by with 0.4 after multiplication
Obtain signal 0.4u os 2, signal 0.4u os 2It is delivered to the A/D of controller 81Port.Purpose using first via multiplier is by just
The voltage signal of negative alternationu osIt is transformed into permanent positive signal 0.4u os 2。
Current transformer 2 is by the output current of combining inverter 9i oChange into the voltage signal of low-voltage alternating-currentu iop, voltage
Signalu iopSquare-wave signal is changed into by the primary sinusoid-square wave conversion circuit 6u iodI/O to controller 82Port.Voltage is believed
Numberu iopVoltage signal is obtained by the filtering of the second low pass filter 4u ios, voltage signalu iosDivide two-way connection four-quadrant multiplier 7
No. second multiplier two inputs, two voltage signalsu iosAfter multiplication signal 0.4 is obtained multiplied by with 0.4u ios 2, signal
0.4u ios 2It is delivered to the A/D of controller 82Port.
As shown in Fig. 2 the first low pass filter 3 is by resistanceR 13, resistanceR 14, resistanceR 15, operational amplifier A MP2 and electric capacityC 11Composition.Second low pass filter 4 is by resistanceR 22, resistanceR 23, resistanceR 24, operational amplifier A MP3 and electric capacityC 21Composition.The
One sine wave-square wave conversion circuit 5 is by resistanceR 1~R 6, operational amplifier A MP1, electric capacityC 1~C 3With diode D1~D2Composition.The
Two sine waves-square wave conversion circuit 6 is by resistanceR 31~R 36, operational amplifier A MP4, electric capacityC 31~C 33With diode D31~D32Group
Into.Four-quadrant multiplier 7 is powered by positive and negative 5V power supplys, electric capacityC 12And electric capacityC 13Play a part of to power filter.
The output voltage of combining inverter 9u oReference output plus terminal and resistanceR 11Voltage transformer 1 is connected after series connection
The different name end of primary coil, the Same Name of Ends and output voltage of the primary coil of voltage transformer 1u oReference output negative terminal be connected,
The secondary coil both ends connection resistance of voltage transformer 1R 12Both ends；The Same Name of Ends of the secondary coil of the voltage transformer 1 with
ResistanceR 13It is connected, resistanceR 13With electric capacityC 11Branch road and resistance in seriesR 12Parallel connection, electric capacityC 11With resistanceR 12Between
Tie point is connected with earth terminal GND, resistanceR 13With electric capacityC 11The tie point of series connection and operational amplifier A MP2 homophase input
End is connected.Operational amplifier A MP2 is powered by positive and negative 5V power supplys, and operational amplifier A MP2 is connected with positive 5V and negative 5V power supply
Connect.ResistanceR 14With resistanceR 15Branch road both ends difference concatenation operation amplifier AMP2 in series output and ground
GND, resistanceR 14With resistanceR 15Between tie point be connected with operational amplifier A MP2 inverting input.Operational amplifier
AMP2 output end is connected with the input pin X1 and input pin Y1 of the first via multiplier of four-quadrant multiplier 7 respectively,
The output pin W1 of the first via multiplier of the four-quadrant multiplier 7 and input pin A/D of controller 81It is connected, realizes output
Voltageu oDetection.
The Same Name of Ends and diode of the secondary coil of voltage transformer 1D 1It is connected, diodeD 1With resistanceR 1It is in series,
ResistanceR 1With resistanceR 2Form resistance series circuit, resistanceR 2The other end is connected with earth terminal GND.ResistanceR 1With resistanceR 2Company
Contact and resistanceR 3Connection, resistanceR 3With electric capacityC 1It is connected, electric capacityC 1It is connected with earth terminal GND, resistanceR 3And electric capacityC 1Structure
Into rc filter circuit.ResistanceR 3With electric capacityC 1Tie point and resistanceR 4Connection, resistanceR 4With operational amplifier A MP1 same phase
Input is connected.Operational amplifier A MP1 is powered by positive and negative 5V power supplys, operational amplifier A MP1 and positive 5V and negative 5V power supply phase
Connection, resistanceR 5Concatenation operation amplifier AMP1 reverse input end and earth terminal GND.Electric capacityC 2And electric capacityC 3And earth terminal
GND is connected, electric capacityC 2It is connected with negative 5V power supply, electric capacityC 3It is connected with positive 5V power supply, electric capacityC 2And electric capacityC 3For filter
Ripple electric capacity.By being connected with earth terminal GND, operational amplifier A MP1 output end passes through operational amplifier A MP1 output end
ResistanceR 6It is connected with positive 5V power supplys, operational amplifier A MP1 output end and the I/O of controller 81Port is connected, voltage letter
Numberu opSquare-wave signal is converted into by the primary sinusoid-square wave conversion circuit 5.
The output current of combining inverter 9i oThrough the iron core of current transformer 2, current transformer 2 and resistanceR 21It is in parallel
Connection, resistanceR 21It is connected with earth terminal GND, the induced-current of current transformer 2i opFlow through resistanceR 21Both ends.Current Mutual Inductance
The output end and resistance of device 2R 22It is connected, resistanceR 22With electric capacityC 21Branch road and resistance in seriesR 21Parallel connection, resistanceR 22With
Electric capacityC 21The tie point of series connection is connected with operational amplifier A MP3 in-phase input end.Operational amplifier A MP3 is by positive and negative 5V electricity
Source powers, and operational amplifier A MP3 is connected with positive 5V and negative 5V power supply.ResistanceR 23With resistanceR 24Branch road two in series
End is connected with operational amplifier A MP3 output and ground GND respectively, resistanceR 23With resistanceR 24Between tie point with
Operational amplifier A MP3 inverting input is connected.Resistance R23, resistance R24 and operational amplifier A MP3 form anti-phase computing
Amplifier.Input pin X2 and input of the operational amplifier A MP3 output end with No. second multiplier of four-quadrant multiplier 7
Pin Y2 is connected, the output pin W2 of No. second multiplier and the input pin A/D of controller 8 of four-quadrant multiplier 72Phase
Connection, realizes output currenti oDetection.
Induced-currenti opFlow through resistanceR 21Both ends obtain voltage signalu iop, current transformer 2 and diodeD 31It is connected,
DiodeD 31With resistanceR 31It is in series, resistanceR 31With resistanceR 32It is in series, resistanceR 32It is connected with earth terminal GND, resistanceR 31
With resistanceR 32Between tie point and resistanceR 33Connection, resistanceR 33With electric capacityC 31It is connected, electric capacityC 31It is connected with earth terminal GND
Connect, resistanceR 33And electric capacityC 31Form rc filter circuit.ResistanceR 33With electric capacityC 31Tie point and resistanceR 34Connection, resistanceR 34
It is connected with operational amplifier A MP4 in-phase input end.Operational amplifier A MP4 is powered by positive and negative 5V power supplys, operational amplifier
AMP4 is connected with positive 5V and negative 5V power supply, resistanceR 35Both ends be connected to operational amplifier A MP4 reverse input end and connect
Ground terminal GND.Electric capacityC 32And electric capacityC 33For filter capacitor, electric capacityC 32It is connected between positive 5V power supplys and earth terminal GND, electric capacityC 33
It is connected between negative 5V power supplys and earth terminal GND；Operational amplifier A MP4 output end passes through diodeD 32With earth terminal GND phases
Connection, operational amplifier A MP4 output end pass through resistanceR 36It is connected with positive 5V power supplys, operational amplifier A MP4 output end
With the I/O of controller 82Port is connected, so as to obtain output currenti oSquare-wave signal.
The output voltage of combining inverter 9u oBoth ends are through resistanceR 11Voltage transformer 1, voltage transformer 1 are connected after current limliting
Model select DL-PT202H1, the transformer is current mode voltage transformer.The primary coil of voltage transformer 1 and secondary line
The turn ratio of circle is 1：1, the secondary coil of voltage transformer 1 is connected in parallel resistanceR 12, in resistanceR 12Both ends obtain voltage signalu op, by changing resistanceR 11And resistanceR 12Resistance can adjust output voltageu oWith voltage signalu opRatio.Output voltageu oAnd voltage signalu opDirectly proportional, its waveform is identical, frequency is identical but amplitude is different, is all 50Hz or so AC sine
Ripple, under normal circumstances not comprising DC component.ResistanceR 13, electric capacityC 11, operational amplifier A MP2, resistanceR 14, resistanceR 15Form one
The first active low pass filter 3 of rank.First low pass filter 3 is by voltage signalu opVoltage signal is obtained after filteringu os。
Four-quadrant multiplier 7 is from the four-quadrant multiplier of MLT04 models, voltage signalu osConnect four-quadrant multiplier
7 the 3rd pin X1 and the 4th pin Y1,0.4 is exported by the 1st pin W1u os 2.Four-quadrant multiplier 7 has two signal multiplications
Multiplied by with 0.4 times of function.Due to the A/D of controller 81The input upper limit of pin is generally 2.5V ~ 3.3V, if voltage signalu osAmplitude be 2.5V, then 0.4u os 2Amplitude be just also 2.5V.
The output current of combining inverter 9i oThrough the iron core of current transformer 2, the model of current transformer 2 selects DL-
CT03, the induced-current of current transformer 2i opFlow through resistanceR 21Both ends, in resistanceR 21Both ends obtain voltage signalu iop, pass through
Change resistanceR 21Resistance can adjust output currenti oWith voltage signalu iopRatio.Output currenti oAnd voltage signalu iop
Directly proportional, its waveform is identical, frequency is identical but amplitude is different, is all 50Hz or so AC sine wave, under normal circumstances not
Include DC component.ResistanceR 22, electric capacityC 21, operational amplifier A MP3, resistanceR 23, resistanceR 24Form active second low of single order
Bandpass filter 4.Second low pass filter 4 is by voltage signalu iopVoltage signal is obtained after filteringu ios.Signalu iosConnect four-quadrant
6th pin Y2 of multiplier 7 and the 7th pin X2,0.4 is exported by the 9th pin W2u ios 2, the signal is sent to the A/D of controller 82Draw
Pin.Four-quadrant multiplier 7 has two signal multiplications multiplied by with 0.4 times of function, due to the A/D of controller 82Pin it is defeated
Enter the upper limit and be generally 2.5V ~ 3.3V, if signalu iosAmplitude be 2.5V, then 0.4u ios 2Amplitude be just also 2.5V.
The output current of current transformer 2i opConnecting resistanceR 21, in resistanceR 21Both ends obtain voltage signalu iop, can pass through
Change resistanceR 21Resistance regulation voltage signalu iopSize.Because resistanceR 21Resistance be not more than 50 Ω, electric currenti opIt is exhausted
Flow mostly through resistanceR 21, so being approximately considered electric currenti opWith voltage signalu iopIt is corresponding proportional.Output voltageu oWith output electricity
Streami o, voltage signalu iopFrequency it is identical, be 50Hz or so AC sine wave, under normal circumstances not comprising DC component.
As shown in figure 3, voltage signalu opThe process that square wave is converted into by the primary sinusoid-square wave conversion circuit 5 is：Electricity
Press signalu opFirst pass through diodeD 2, work as voltage（Amplitude）u opDuring more than 0V, diodeD 1Conducting；Work as voltage（Amplitude）u opIt is less than
During 0V, diodeD 1Cut-off, by voltageu ohIt is clamped to more than 0V.ResistanceR 1And resistanceR 2By voltageu ohPartial pressure, then by resistanceR 3, electric capacityC 1Signal is sent to operational amplifier A MP1 in-phase input end, operational amplifier A MP1's is anti-phase defeated after capacitance-resistance filter
Enter end and pass through resistanceR 5Ground connection, because amplifier input electric current is empty disconnected, operational amplifier A MP1 anti-phase input terminal potential is 0V.
When operational amplifier A MP1 in-phase end current potential is more than 0V, output signalu odFor high level, on the contrary is low level.When computing is put
When big device AMP1 output voltage is less than 0V, diodeD 2Turn on voltageu odIt is clamped to 0V.
As shown in figure 3, voltage signalu iopThe process that square wave is converted into by the second sine wave-square wave conversion circuit 6 is：
Voltage signalu iopFirst pass through diodeD 31, work as voltageu iop（Amplitude）During more than 0V, diodeD 31Conducting；Work as voltageu iopIt is less than
During 0V, diodeD 31Cut-off, by voltageu iohIt is clamped to more than 0V.ResistanceR 31WithR 32By voltageu iohPartial pressure, then by resistanceR 33, electric capacityC 31Signal is sent to operational amplifier A MP4 in-phase input end, operational amplifier A MP4's is anti-phase after capacitance-resistance filter
Input passes through resistanceR 35Ground connection, because amplifier input electric current is empty disconnected, operational amplifier A MP4 anti-phase input terminal potential is
0V.When operational amplifier A MP4 in-phase end current potential is more than 0V, output signalu iodFor high level, on the contrary is low level.Work as fortune
When calculation amplifier AMP4 output voltage is less than 0V, diodeD 32Turn on voltageu iodIt is clamped to 0V.The primary sinusoid-square wave
The operation principle of change-over circuit 5 and the second sine wave-square wave conversion circuit 6, Component selection, parameter selection are identical, so
It may insure voltage signalu odRelative to voltage signalu opPhase shifting angle be equal to signalu iodRelative to voltage signalu iop's
Phase shifting angle, so that it is guaranteed that signalu iodRelative to voltage signalu odPhase shifting angle be equal to electric currenti oRelative to voltageu oShifting
Phase angle.
According to square-wave signalu odAnd square-wave signalu iodThe time difference of rising edge obtains square-wave signalu odHysteresis（It is or advanced）
Square-wave signalu iodTimeT 2, phase difference valueα-βRadian value can be represented by the formula：α-β= 2π (T 2/ T 1) (rad), phase
Potential difference schematic diagram is as shown in Figure 3.Phase difference valueα-βIt can be used for the apparent energy for calculating combining inverter outputS, active powerPAnd reactive powerQ.Wherein,S=u o· i o；P= u o· i o·cos(α-β) ；P= u o· i o·sin(α-β)。
The rapid analysis method of the output voltage electric current of a kind of grid-connected inverting system, it is characterised in that step is as follows：
Step 1：The output voltage current sensing means of grid-connected inverting system is built, by the primary coil of voltage transformer 1 and simultaneously
The output voltage of net inverter 9u oParallel connection, by output voltageu oChange into the voltage signal of low-voltage alternating-currentu op, voltage signalu opBy
The primary sinusoid-square wave conversion circuit 5 changes into square-wave signalu odI/O to controller 81Port；Voltage signalu opBy first
The filtering of low pass filter 3 obtains voltage signalu os, two voltage signalsu osThe first via for connecting four-quadrant multiplier 7 respectively multiplies
Two inputs of musical instruments used in a Buddhist or Taoist mass obtain signal 0.4u os 2, signal 0.4u os 2It is delivered to the A/D of controller 81Port；Current transformer 2
By the output current of combining inverter 9i oChange into the voltage signal of low-voltage alternating-currentu iop, voltage signalu iopBy the second sine wave-
Square wave conversion circuit 6 changes into square-wave signalu iodI/O to controller 82Port；Voltage signalu iopBy the second low pass filter
4 filtering obtain voltage signalu ios, voltage signalu iosTwo inputs of No. second multiplier of four-quadrant multiplier 7 are connected respectively
End makes two voltage signalsu iosAfter multiplication signal 0.4 is obtained multiplied by with 0.4u ios 2, signal 0.4u ios 2It is delivered to the A/ of controller 8
D2Port.
Step 2：Controller 8 obtains square-wave signalu odFrequencyf 1, controller 8 compares square-wave signalu odWith square-wave signalu iodPhase difference valueα-β,αFor output voltageu oPhase angle,βFor output currenti oPhase angle.
Sine wave is become square wave by the present invention respectively using two sine wave-square wave conversion circuits, for detecting output electricity
Pressureu oWith output currenti oFrequency and phase relation.According to country《Power supply and business rules》Regulation：In power system normal condition
Under, the tolerance of frequency of supply is：It it is ± 0.2 hertz when installed capacity in power grid is in 3,000,000 kilowatts and the above；Work as power network
Installed capacity is ± 0.5 hertz below 3,000,000 kilowatts；When under power system abnormal condition, allowable deviation of power frequency
It is not to be exceeded ± 1.0 hertz.Therefore, it is possible to judge that the output voltage of combining inverter 9u oWith output currenti oFrequency range be
49 ~ 51 Hz, it is converted between time in each cycle is about 0.019608 ~ 0.020408 s；Output voltageu oWith output currenti o
Frequency it is identical, phase angle relation between+90 ° ~ -90 °, be converted into the time be about+0.005 ~ -0.005s between.
Square-wave signalu odFrequency correspond to the output voltage of combining inverter 9u oFrequencyf 1.Output voltageu oPhase angle
ForαIf output currenti oPhase angle beβ, phase difference valueα-βCorresponding to output voltageu oAnd output currenti oPhase difference valueα-β, delimiting periodT 1=1/f 1。
Step 3：A/D converter inside controller 8 is by signal 0.4u os 2It is converted into digital quantity and is stored in memory, its
Inu os=|u os|sin(α)；Signal 0.4 is taken out from the memory inside controller 8u os 2BeforeT 1/ 4 moment waveform 0.4 [|u os|sin(α+90)]2Corresponding digital quantity, obtains output voltageu oVirtual valueU CAL=k 1·0.4{(|u os|sinα)2+[|u os
|sin(α+90)]2, wherein,k 1For constant coefficient, unit 1/V.
With output voltageu oExemplified by, wherein signal square (|u os|sinα)2Completed using hardware multiplier, controller 8 is read
Take (|u os|sinα)2It is converted into digital quantity and stores the digital quantity, signal square [|u os|sin(α+90)]2Actually signal
90 ° of delay（1/4 cycle, about 0.005 s）Value, [|u os|sin(α+90)]2Corresponding digital quantity isT 1Sin before/4 cycles2
Digital quantity corresponding to (α), after the digital quantity is taken out by controller 8 from memory, with (|u os|sinα)2Corresponding digital quantity phase
Add to obtain DC digital amount.The DC digital amount and output voltageu oVirtual value correspond to it is proportional.The present invention is according to sin2(α)+
sin2The operation principle of (+90 ° of α)=1, by signal (2 u os|sinα)2With signal [|u os|sin(α+90)]2It is added and can obtain surely
Fixed DC quantity, and the DC quantity and output voltageu oVirtual value correspond to it is proportional.
As shown in figure 4, the A/D of controller 81Port connects signal 0.4u os 2(=0.4|u os|2sin2α), inside controller 8
A/D converter convert the signal into digital quantity, and the digital quantity is stored in memory, the digital quantity and output voltageu oBase
Square correspondence of ripple is proportional.Taken out from the memory inside controller 8 in signal 0.4u os 2BeforeT 1The waveform at/4 moment
0.4[|u os|sin(α+90)]2Corresponding digital quantity, by the two be added 0.4 (|u os|sinα)2+[|u os|sin(α+90)
]2}/V2.OrderU CALRepresent voltageu oVirtual value, ignore harmonic effects, thenU CAL=k 1·0.4{(|u os|sinα)2+[|u os|sin
(α+90)]2, whereink 1For constant coefficient, unit 1/V.It can be seen that using controller 8 by the positive fluctuating signal 0.4 of two perseverancesu os 2
With 0.4 [|u os|sin(α+90)]2Addition obtains the DC quantity unrelated with trigonometric function phase angle, and the DC quantity and output electricity
Pressureu oVirtual valueU CALIt is corresponding proportional.
Step 4：A/D converter inside controller 8 is by signal 0.4u ios 2It is converted into digital quantity and is stored in memory, its
Inu ios=|u ios|sin(α)；Signal 0.4 is taken out from the memory inside controller 8u ios 2BeforeT 1The waveform 0.4 at/4 moment
[|u ios|sin(α+90)]2Corresponding digital quantity, obtains output currenti oVirtual valueI CAL=k 2·0.4{(|u ios|sinα)2+
[|u ios|sin(α+90)]2, wherein,k 2For constant coefficient, unit 1/A.
As shown in figure 5, the A/D of controller 82Port connects signal 0.4u ios 2(=0.4|u ios|2sin2α), in controller 8
The A/D converter in portion converts the signal into digital quantity, and the digital quantity is stored in into memory, the digital quantity and output currenti o
Square correspondence of fundamental wave is proportional.Taken out from the memory inside controller 8 in signal 0.4u ios 2BeforeT 1The ripple at/4 moment
Shape 0.4 [|u ios|sin(α+90)]2Corresponding digital quantity, by the two be added 0.4 (|u ios|sinα)2+[|u ios|sin(α+
90)]2}/V2, orderI CALRepresent electric currenti oVirtual value, ignore harmonic effects, thenI CAL=k 2·0.4{(|u ios|sinα)2+[|u ios
|sin(α+90)]2, whereink 2For constant coefficient, unit 1/A.It can be seen that using controller 8 by the positive fluctuating signal of two perseverances
0.4u ios 2With 0.4 [|u ios|sin(α+90)]2Addition obtains the DC quantity unrelated with trigonometric function phase angle, and the DC quantity with
Electric currenti oVirtual valueI CALIt is corresponding proportional.
Step 5：The rated output apparent energy of grid-connected inverting systemS e=U CAL·I CALRepresented in two-dimentional phase-plane diagram
For constant power curve I and constant power curve II；It is reliably working between the reference axis of constant power curve I and two-dimentional phase plane
Area；It is overload region between constant power curve I and constant power curve II, when output apparent energySSurmount the laggard of constant power curve I
Enter overload region；It is shorting region outside constant power curve II, when output apparent energySSurmount constant power curve II and enter short circuit afterwards
Area.
As shown in fig. 6, voltage effective valueU CALAnd current effective valueI CALCorresponding relation can be retouched with two-dimensional phase plane coordinates
State, when inverter stably exports,U CALWithI CALValue be basically unchanged, in the corresponding coordinate of the first quartile of two-dimentional phase plane
Point.The rated output apparent energy of grid-connected inverting systemS e=U CAL·I CALConstant power curve I is expressed as in two-dimentional phase-plane diagram
With constant power curve II.As long as power identical curve is all constant power curve, so whetheing there is several constant powers song in phasor
Line.It is reliably working area between the reference axis of constant power curve I and two-dimentional phase plane, being can be long-term within constant power curve I
The load born；It is overload region between constant power curve I and constant power curve II, when output apparent energySSurmount constant power song
Enter overload region after line I；It is shorting region outside constant power curve II, when output apparent energySSurmount constant power curve II it
Enter shorting region afterwards.
Step 6：The two-dimentional phase-plane diagram established by step 5 judges the output voltage of combining inverter 9u oIt is and defeated
Go out electric currenti oWhether situation jumpy is boosted or loaded in appearance.
The output voltage of combining inverter 9u oWith output currenti oWhen increased ratio is essentially identical, it is judged as voltage drastically
Raise and load is basically unchanged, steady operation point moves rapidly to the upper right side of the first quartile of two-dimentional phase-plane diagram；Work as output
Voltageu oIt is basically unchanged, output currenti oWhen increased dramatically, it is judged as that load increased dramatically, steady operation point is rapidly to two-dimensional phase
The surface movement of plane first quartile.
As shown in fig. 7, operating point is represented in two-dimentional phase plane, specific voltage effective valueU CALWith specific currents virtual valueI CALA point in corresponding phase plane.Back and forth shaken if operating point constant power direction of curve in two-dimentional phase-plane diagram interior edge
Swing, then it represents that reactive power oscillation occurs in grid-connected inverting system, and active output is basically unchanged；
If operating point the direction reciprocating vibration vertical with constant power curve in two-dimentional phase-plane diagram interior edge, then it represents that grid-connected inverse
There is active vibration in change system, and idle output is basically unchanged；
If operating point in two-dimentional phase-plane diagram neither along constant power direction of a curve reciprocating vibration, also not along with constant power
The vertical direction reciprocating vibration of curve, but rambling vibration, then it represents that chaotic oscillation occurs in grid-connected inverting system.
Sampled value (|u ios|sinα)2(|u os|sinα)2For a pulsating quantity containing DC component and AC compounent,
Work as output currenti oAnd output voltageu oWhen increased dramatically, the amplitude of its instantaneous value increase is continually changing, and this causes different
Judge that the increase multiple of output current and output voltage is relatively difficult at the time of often arrival.The present invention is obtained not going out with calculating method
When now abnormal, current time (|u ios|sinα)2(|u os|sinα)2Instantaneous value, when calculating instantaneous value and abnormal moment and occurring
The ratio of instantaneous value be output currenti oAnd output voltageu oThe multiple that increased dramatically.
The present invention reduces multiplication and iterative algorithm as far as possible, detection speed is improved, with a currently available A/D Change-over knot
Fruit can judge whether the output voltage of grid-connected inverting system and electric current occur boosting or loading situation jumpy, make
Whether controller real-time judge grid-connected inverting system there is the excessively stream that can not be born for a long time and boosting phenomenon.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God any modification, equivalent substitution and improvements made etc., should be included in the scope of the protection with principle.
Claims (9)
1. the output voltage current sensing means of a kind of grid-connected inverting system, it is characterised in that including voltage transformer（1）, electricity
Current transformer（2）, the first low pass filter（3）, the second low pass filter（4）, the primary sinusoid-square wave conversion circuit（5）,
Two sine waves-square wave conversion circuit（6）, four-quadrant multiplier（7）And controller（8）, the voltage transformer（1）It is mutual with electric current
Sensor（2）Input and combining inverter（9）It is connected, voltage transformer（1）With the first low pass filter（3）It is connected
Connect, the first low pass filter（3）With four-quadrant multiplier（7）First via multiplier be connected, four-quadrant multiplier（7）
Multiplier and controller all the way（8）It is connected；The voltage transformer（1）With the primary sinusoid-square wave conversion circuit（5）It is connected
Connect, the primary sinusoid-square wave conversion circuit（5）With controller（8）It is connected；The current transformer（2）With the second low pass filtered
Ripple device（4）It is connected, the second low pass filter（4）With four-quadrant multiplier（7）No. second multiplier be connected, four-quadrant multiplies
Musical instruments used in a Buddhist or Taoist mass（7）No. second multiplier and controller（8）It is connected；Current transformer（2）With the second sine wave-square wave conversion circuit
（6）It is connected, the second sine wave-square wave conversion circuit（6）With controller（8）It is connected.
2. the output voltage current sensing means of grid-connected inverting system according to claim 1, it is characterised in that it is described simultaneously
Net inverter（9）Output voltageu oReference output plus terminal and resistanceR 11Voltage transformer is connected after series connection（1）Primary side line
The different name end of circle, voltage transformer（1）Primary coil Same Name of Ends and output voltageu oReference output negative terminal be connected, voltage
Transformer（1）Secondary coil both ends connection resistanceR 12Both ends；The voltage transformer（1）Secondary coil Same Name of Ends with
ResistanceR 13It is connected, resistanceR 13With electric capacityC 11Branch road and resistance in seriesR 12Parallel connection, electric capacityC 11With resistanceR 12Between
Tie point is connected with earth terminal GND, resistanceR 13With electric capacityC 11The tie point of series connection and operational amplifier A MP2 homophase input
End is connected, and operational amplifier A MP2 is connected with positive 5V and negative 5V power supply, resistanceR 14With resistanceR 15Branch road in series
Both ends difference concatenation operation amplifier AMP2 output and ground GND, resistanceR 14With resistanceR 15Between tie point and fortune
The inverting input for calculating amplifier AMP2 is connected；The output end of the operational amplifier A MP2 respectively with four-quadrant multiplier（7）
The input pin X1 of first via multiplier be connected with input pin Y1, four-quadrant multiplier（7）First via multiplier
Output pin W1 and controller（8）Input pin A/D1It is connected.
3. the output voltage current sensing means of grid-connected inverting system according to claim 2, it is characterised in that the electricity
Press transformer（1）Secondary coil Same Name of Ends and diodeD 1It is connected, diodeD 1With resistanceR 1It is in series, resistanceR 1With
ResistanceR 2Form resistance series circuit, resistanceR 2The other end is connected with earth terminal GND, resistanceR 1With resistanceR 2Tie point with
ResistanceR 3Connection, resistanceR 3With electric capacityC 1It is connected, electric capacityC 1It is connected with earth terminal GND, resistanceR 3With electric capacityC 1Tie point
With resistanceR 4Connection, resistanceR 4It is connected with operational amplifier A MP1 in-phase input end, operational amplifier A MP1 and positive 5V and negative 5V
Power supply be connected, resistanceR 5Concatenation operation amplifier AMP1 reverse input end and earth terminal GND, electric capacityC 2And electric capacityC 3
It is connected with earth terminal GND, electric capacityC 2It is connected with negative 5V power supply, electric capacityC 3It is connected with positive 5V power supply；Operational amplifier
For AMP1 output end by being connected with earth terminal GND, operational amplifier A MP1 output end passes through resistanceR 6With positive 5V power supplys
It is connected, operational amplifier A MP1 output end and controller（8）I/O1Port is connected.
4. the output voltage current sensing means of grid-connected inverting system according to claim 1, it is characterised in that it is described simultaneously
Net inverter（9）Output currenti oThrough current transformer（2）Iron core, current transformer（2）With resistanceR 21It is connected in parallel,
ResistanceR 21It is connected with earth terminal GND, current transformer（2）Output end and resistanceR 22It is connected, resistanceR 22With electric capacityC 21String
Join the branch road and resistance formedR 21Parallel connection, resistanceR 22With electric capacityC 21The tie point of series connection is same mutually defeated with operational amplifier A MP3's
Enter end to be connected, operational amplifier A MP3 is connected with positive 5V and negative 5V power supply, resistanceR 23With resistanceR 24Branch in series
Road both ends are connected with operational amplifier A MP3 output and ground GND respectively, resistanceR 23With resistanceR 24Between connection
Point is connected with operational amplifier A MP3 inverting input, operational amplifier A MP3 output end and four-quadrant multiplier（7）
The input pin X2 of No. second multiplier be connected with input pin Y2, four-quadrant multiplier（7）No. second multiplier
Output pin W2 and controller（8）Input pin A/D2It is connected.
5. the output voltage current sensing means of grid-connected inverting system according to claim 4, it is characterised in that the electricity
Current transformer（2）With diodeD 31It is connected, diodeD 31With resistanceR 31It is in series, resistanceR 31With resistanceR 32It is in series, electricity
ResistanceR 32It is connected with earth terminal GND, resistanceR 31With resistanceR 32Between tie point and resistanceR 33Connection, resistanceR 33With electric capacityC 31
It is connected, electric capacityC 31It is connected with earth terminal GND, resistanceR 33With electric capacityC 31Tie point and resistanceR 34Connection, resistanceR 34With
Operational amplifier A MP4 in-phase input end is connected, and operational amplifier A MP4 is connected with positive 5V and negative 5V power supply, resistanceR 35Both ends be connected to operational amplifier A MP4 reverse input end and earth terminal GND, electric capacityC 32Positive 5V power supplys are connected to connecing
Between ground terminal GND, electric capacityC 33It is connected between negative 5V power supplys and earth terminal GND；Operational amplifier A MP4 output end passes through two
Pole pipeD 32It is connected with earth terminal GND, operational amplifier A MP4 output end passes through resistanceR 36It is connected with positive 5V power supplys, transports
Calculate amplifier AMP4 output end and controller（8）I/O2Port is connected.
6. the output voltage current sensing means of the grid-connected inverting system according to claim 2 or 4, it is characterised in that institute
State voltage transformer（1）Primary coil and secondary coil turn ratio be 1：1；ResistanceR 13, electric capacityC 11, operational amplifier
AMP2, resistanceR 14, resistanceR 15Form the first active low pass filter of single order（3）；ResistanceR 22, electric capacityC 21, operational amplifier
AMP3, resistanceR 23, resistanceR 24Form the second active low pass filter of single order（4）.
7. the rapid analysis method of the output voltage electric current of a kind of grid-connected inverting system, it is characterised in that step is as follows：
Step 1：The output voltage current sensing means of grid-connected inverting system is built, by voltage transformer（1）Primary coil with
Combining inverter（9）Output voltageu oParallel connection, by output voltageu oChange into the voltage signal of low-voltage alternating-currentu op, voltage signalu opBy the primary sinusoid-square wave conversion circuit（5）Change into square-wave signalu odTo controller（8）I/O1Port；Voltage signalu opBy the first low pass filter（3）Filtering obtains voltage signalu os, two voltage signalsu osFour-quadrant multiplier is connected respectively
（7）Two inputs of first via multiplier obtain signal 0.4u os 2, signal 0.4u os 2It is delivered to controller（8）A/D1End
Mouthful；Current transformer（2）By combining inverter（9）Output currenti oChange into the voltage signal of low-voltage alternating-currentu iop, voltage letter
Numberu iopBy the second sine wave-square wave conversion circuit（6）Change into square-wave signalu iodTo controller（8）I/O2Port；Voltage
Signalu iopBy the second low pass filter（4）Filtering obtains voltage signalu ios, voltage signalu iosFour-quadrant multiplier is connected respectively
（7）Two inputs of No. second multiplier make two voltage signalsu iosAfter multiplication signal 0.4 is obtained multiplied by with 0.4u ios 2,
Signal 0.4u ios 2It is delivered to controller（8）A/D2Port；
Step 2：Controller（8）Obtain square-wave signalu odFrequencyf 1, controller（8）Compare square-wave signalu odWith square-wave signalu iodPhase difference valueα-β,αFor output voltageu oPhase angle,βFor output currenti oPhase angle；
Step 3：Controller（8）Internal A/D converter is by signal 0.4u os 2It is converted into digital quantity and is stored in memory, whereinu os=|u os|sin(α)；From controller（8）Signal 0.4 is taken out in internal memoryu os 2BeforeT 1/ 4 moment waveform 0.4 [|u os|sin(α+90)]2Corresponding digital quantity, obtains output voltageu oVirtual valueU CAL=k 1·0.4{(|u os|sinα)2+[|u os
|sin(α+90)]2, wherein,k 1For constant coefficient, unit 1/V；
Step 4：Controller（8）Internal A/D converter is by signal 0.4u ios 2It is converted into digital quantity and is stored in memory, whereinu ios=|u ios|sin(α)；From controller（8）Signal 0.4 is taken out in internal memoryu ios 2BeforeT 1The waveform 0.4 at/4 moment
[|u ios|sin(α+90)]2Corresponding digital quantity, obtain output voltage electric currenti oVirtual valueI CAL=k 2·0.4{(|u ios|sin
α)2+[|u ios|sin(α+90)]2, wherein,k 2For constant coefficient, unit 1/A；
Step 5：The rated output apparent energy of grid-connected inverting systemS e=U CAL·I CALIt is expressed as waiting work(in two-dimentional phase-plane diagram
Rate curve I and constant power curve II；It is reliably working area between the reference axis of constant power curve I and two-dimentional phase plane；Deng work(
It is overload region between rate curve I and constant power curve II, when output apparent energySSurmount constant power curve I and enter overload afterwards
Area；It is shorting region outside constant power curve II, when output apparent energySSurmount constant power curve II and enter shorting region afterwards；
Step 6：The two-dimentional phase-plane diagram established by step 5 judges combining inverter（9）Output voltageu oAnd output electricity
Streami oWhether situation jumpy is boosted or loaded in appearance.
8. the rapid analysis method of the output voltage electric current of grid-connected inverting system according to claim 7, it is characterised in that
The combining inverter（9）Output voltageu oWith output currenti oWhen increased ratio is essentially identical, it is judged as that voltage drastically rises
High and load is basically unchanged, and steady operation point moves rapidly to the upper right side of the first quartile of two-dimentional phase-plane diagram；When output electricity
Pressureu oIt is basically unchanged, output currenti oWhen increased dramatically, it is judged as that load increased dramatically, steady operation point is equal to two dimension rapidly
The surface movement of face first quartile.
9. the rapid analysis method of the output voltage electric current of grid-connected inverting system according to claim 7, it is characterised in that
If operating point constant power direction of curve reciprocating vibration in two-dimentional phase-plane diagram interior edge, then it represents that grid-connected inverting system occurs
Reactive power oscillation, active output are basically unchanged；
If operating point the direction reciprocating vibration vertical with constant power curve in two-dimentional phase-plane diagram interior edge, then it represents that grid-connected inverse
There is active vibration in change system, and idle output is basically unchanged；
If operating point in two-dimentional phase-plane diagram neither along constant power direction of a curve reciprocating vibration, also not along with constant power
The vertical direction reciprocating vibration of curve, but rambling vibration, then it represents that chaotic oscillation occurs in grid-connected inverting system.
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